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4.7 Buffer storage tank
Reservoir for heated water. Is an absolute necessity. The
size is selected using the following rule of thumb: 50 l/kW
(kW output for houses), above 700 l.
4. Installing the Profi W boiler stove
4.1 Regulations:
The current editions of the relevant DIN standards and
technical codes of practice must be observed.
4.2 Connecting to the heating system:
All junctions between the heating insert connections and
the heating circuits must be implemented using unions.
4.3 Feed:
The Schmid Profi W completely submerged heating insert
is suitable for preparing hot water for heating systems with
allowable feed temperatures up to 100 °C.
4.4 Heating system execution:
As (1) open system with elevated expansion tank, with
safety feed pipe and safety return pipe to DIN EN 12828 or
as (2) closed system to DIN EN 12828.
(1) Open system:
The hydrostatic head at the lowest point on the boiler may
not exceed 2.5 bar (25 m water column) to DIN EN 12828.
The air from the boiler stove must be able discharge
through the open expansion tank.
(2) Closed system:
The hydrostatic head at the lowest point on thermosta-
tically controlled boiler systems may not exceed 1.5 bar
(15 m water column) to DIN EN 12828. The following
components must be installed on closed systems fitted
with closed expansion tanks to DIN EN 12828:
a component-tested, code H, pressure relief valve,
activating at a positive pressure of 2.5 bar (25 m water
column) and
a metal automatic vent valve.
(Point 4.8 Fig. 1)
4.5 Circulation pump
A circulation pump with non-return valve must be used.
Flow direction (arrow) towards hot water top pipe bank.
The thermostat (Point 4.8 Fig. 1) may only switch on the
pump when the water temperature in the heating insert has
reached approx. 60° C.
4.6 Return boost:
A permanent return boost must be installed to allow the
bank to be operated with a return temperature of at least
55 °C or, even better, 60 °C (less soot deposits).
?
?
Warning:
Non-installation of the return boost will lead to
corrosion, shining soot formation on the bank heating
surfaces and condensation in the hot water bank,
heating insert, fire tube and flue!
4.9 Electrical connections
(may only be connected by an authorised electrician)
7
www.schmid.st
4.8 Water connection diagram for connecting the
Profi W boiler stove
Point 4.8 Fig. 1
Point 4.9 Fig. 1
Temperature
Digital thermostat
or
Differential temperature controller
Circulation pump
Heating system
Mains
L
L
N
=
=
=
black
blue
green/yellow
N
Feed, 3/4"
Cold water inlet
Sensor for thermal discharge safety device, 1/2"
Thermal discharge safety device
Return, 3/4"
Pressure relief
valve
Automatic vent
Drain, 1/2"
Isolating valve
with thermometer
Return boost sensor
Expansion tank
with pressure gauge
Non-return valve
Return boost
Circulation pump
Thermostat for
circulation pump,
with sensor, 1/2"
7


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